Iliamna weather in December: Iliamna, Alaska: normal highs, lows, rain and records for December
Iliamna in December has a normal high of 28°F and a normal low of 15°F, a daily mean of 22°F, falling from 30°F on the 1st to 25°F by the 31st. Measurable precipitation falls on 11 days in a normal December, 1.45 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of −2°C and low of −9°C, 37 mm of precipitation in December.
- NOAA stationIliamna Airport
- Station IDUSW00025506
- Location59.75°N 154.91°W
- Elevation143 ft (44 m)
- Population (census place)45
- Jan 25° 12°
- Feb 30° 16°
- Mar 32° 16°
- Apr 43° 29°
- May 55° 38°
- Jun 62° 45°
- Jul 65° 51°
- Aug 64° 50°
- Sep 56° 43°
- Oct 45° 32°
- Nov 33° 21°
- Dec 28° 15°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Iliamna in December?
The normal high is 28°F and the normal low 15°F, for a daily mean of 21.7°F. December is 5.4°F cooler than November and 3.3°F warmer than January. December is the 11th warmest month of the year in Iliamna and the 7th wettest. Across the month the normal high falls 5°F, from 30°F on December 1 to 25°F on December 31. From one year to the next December's mean temperature typically moves about 7.2°F either way (NOAA's standard deviation), so roughly two Decembers in three average between 15°F and 29°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 37%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| December 1 | 30°F | 18°F | 37% | 17% |
| December 8 | 30°F | 17°F | 36% | 16% |
| December 15 | 28°F | 16°F | 34% | 15% |
| December 22 | 27°F | 14°F | 32% | 14% |
| December 31 | 25°F | 12°F | 30% | 13% |
Every day of December: normal high, low and chance of precipitation (warmest afternoon December 1, coldest night December 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| December 1 | 30°F | 18°F | 37% | 17% | 6 h 40 min |
| December 2 | 30°F | 18°F | 37% | 17% | 6 h 30 min |
| December 3 | 30°F | 18°F | 36% | 17% | 6 h 30 min |
| December 4 | 30°F | 18°F | 36% | 17% | 6 h 30 min |
| December 5 | 30°F | 18°F | 36% | 17% | 6 h 20 min |
| December 6 | 30°F | 18°F | 36% | 17% | 6 h 20 min |
| December 7 | 30°F | 17°F | 36% | 16% | 6 h 20 min |
| December 8 | 30°F | 17°F | 36% | 16% | 6 h 10 min |
| December 9 | 29°F | 17°F | 36% | 16% | 6 h 10 min |
| December 10 | 29°F | 17°F | 35% | 16% | 6 h 10 min |
| December 11 | 29°F | 17°F | 35% | 16% | 6 h 10 min |
| December 12 | 29°F | 16°F | 35% | 16% | 6 h 10 min |
| December 13 | 29°F | 16°F | 35% | 15% | 6 h |
| December 14 | 29°F | 16°F | 34% | 15% | 6 h |
| December 15 | 28°F | 16°F | 34% | 15% | 6 h |
| December 16 | 28°F | 16°F | 34% | 15% | 6 h |
| December 17 | 28°F | 15°F | 34% | 15% | 6 h |
| December 18 | 28°F | 15°F | 33% | 15% | 6 h |
| December 19 | 28°F | 15°F | 33% | 14% | 6 h |
| December 20 | 27°F | 15°F | 33% | 14% | 6 h |
| December 21 | 27°F | 14°F | 32% | 14% | 6 h |
| December 22 | 27°F | 14°F | 32% | 14% | 6 h |
| December 23 | 27°F | 14°F | 32% | 14% | 6 h |
| December 24 | 27°F | 14°F | 32% | 14% | 6 h |
| December 25 | 26°F | 13°F | 32% | 14% | 6 h |
| December 26 | 26°F | 13°F | 31% | 13% | 6 h |
| December 27 | 26°F | 13°F | 31% | 13% | 6 h |
| December 28 | 26°F | 13°F | 31% | 13% | 6 h |
| December 29 | 26°F | 12°F | 30% | 13% | 6 h |
| December 30 | 25°F | 12°F | 30% | 13% | 6 h |
| December 31 | 25°F | 12°F | 30% | 13% | 6 h |
- Normal high
- 28°FDecember average
- Normal low
- 15°FDecember average
- Precipitation
- 1.45 inmonth total
- Days with precipitation
- 110.01 inch or more
- Nights at 32°F or colder
- 26
- Daylight
- 6 h 40 min to 6 hDecember 1 to December 31
- Sunshine
- 49%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00025506; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Iliamna in December?
On a given December day the chance of 0.01 inch or more is 34% on average, highest around December 1 (37%). In all, 1.45 in falls on 11 days of a normal December.
In a normal December in Iliamna, 26 nights fall to freezing and 16 days stay below freezing all day.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00025506.
How humid and windy is Iliamna in December?
At 3 p.m. the normal temperature is 19°F with 77% relative humidity and a dew point of 13°F; at 6 a.m. it is 18°F with 80% humidity. The wind averages 11.4 mph, most often from the northeast in the afternoon. A dew point under 50°F feels dry.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 18°F | 13°F | 80% | 11.5 mph | – |
| 9 a.m. | 18°F | 13°F | 80% | 11.2 mph | 39% |
| noon | 19°F | 13°F | 78% | 11.4 mph | – |
| 3 p.m. | 19°F | 13°F | 77% | 11.5 mph | 27% |
| 6 p.m. | 19°F | 13°F | 79% | 11.3 mph | – |
| 9 p.m. | 18°F | 13°F | 78% | 11.3 mph | 31% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00025506. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for December in Iliamna?
The warmest December temperature on this station's record (since 1920) is 49°F, on December 7, 2014; the coldest is −31°F, on December 15, 1946. The wettest December brought 5.49 in (1943); the snowiest, 42.7 inches (1948).
The December mean against the 1991-2020 normal of 21.7°F: 2021 18.3°F (−3.4), 2022 20.2°F (−1.5), 2023 14.4°F (−7.3), 2024 33.2°F (+11.5), 2025 11.2°F (−10.5). 1 of 5 ran warmer than normal.
| December | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 18.3°F | −3.4°F | 3.15 in |
| 2022 | 20.2°F | −1.5°F | 1.65 in |
| 2023 | 14.4°F | −7.3°F | 1.59 in |
| 2024 | 33.2°F | +11.5°F | 1.32 in |
| 2025 | 11.2°F | −10.5°F | 0.57 in |
Source: records: ACIS, station USW00025506; recent months: ACIS, station USW00025506. Records and recent months use complete months only.
How does December in Iliamna compare across Alaska?
Across the 85 places PlainClimate covers in Alaska, December normal highs run from −7°F in Chicken to 42°F in Sitka; Iliamna's is 28°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.